feat(angular): add helper function to devkit to add viewProviders to a component (#26526)

## Current Behavior

Angular Nx utils have `addProviderToComponent` function to add a
provider to an Angular component, but are missing a function to add
viewProviders.

## Expected Behavior

There should be a function like `addProviderToComponent` to add view
providers to a component.

Co-authored-by: Leosvel Pérez Espinosa <leosvel.perez.espinosa@gmail.com>

packages/angular/src/utils/index.ts

@@ -14,6 +14,7 @@ export {
   addProviderToAppConfig,
   addProviderToComponent,
   addProviderToModule,
+  addViewProviderToComponent,
 } from './nx-devkit/ast-utils';
 
 export { addRoute, addProviderToRoute } from './nx-devkit/route-utils';

packages/angular/src/utils/nx-devkit/ast-utils.spec.ts

@@ -5,6 +5,7 @@ import {
   addImportToPipe,
   addProviderToAppConfig,
   addProviderToBootstrapApplication,
+  addViewProviderToComponent,
   isStandalone,
 } from './ast-utils';
 import { createTreeWithEmptyWorkspace } from '@nx/devkit/testing';
@@ -334,4 +335,50 @@ export const appConfig: ApplicationConfig = {
       };"
     `);
   });
+
+  it('should add view provider to a component', () => {
+    // ARRANGE
+    const pathToComponent = 'app.component.ts';
+    const componentOriginal = `import { Component } from '@angular/core';
+
+@Component({
+  selector: 'app-app',
+  template: ''
+})
+export class AppComponent {}
+`;
+    const providerName = 'MyViewProvider';
+
+    const tree = createTreeWithEmptyWorkspace({ layout: 'apps-libs' });
+
+    tree.write(pathToComponent, componentOriginal);
+
+    const tsSourceFile = createSourceFile(
+      pathToComponent,
+      componentOriginal,
+      ScriptTarget.Latest,
+      true
+    );
+
+    // ACT
+    addViewProviderToComponent(
+      tree,
+      tsSourceFile,
+      pathToComponent,
+      providerName
+    );
+
+    // ASSERT
+    expect(tree.read(pathToComponent, 'utf-8')).toMatchInlineSnapshot(`
+      "import { Component } from '@angular/core';
+
+      @Component({
+        selector: 'app-app',
+        template: '',
+        viewProviders: [MyViewProvider]
+      })
+      export class AppComponent {}
+      "
+    `);
+  });
 });

packages/angular/src/utils/nx-devkit/ast-utils.ts

@@ -826,6 +826,29 @@ export function addProviderToComponent(
   );
 }
 
+/**
+ * Add a view provider to a Standalone Component
+ * @param host Virtual Tree
+ * @param source TS Source File containing the Component
+ * @param componentPath Path to the Component
+ * @param symbolName The provider to add
+ */
+export function addViewProviderToComponent(
+  host: Tree,
+  source: ts.SourceFile,
+  componentPath: string,
+  symbolName: string
+): ts.SourceFile {
+  return _addSymbolToDecoratorMetadata(
+    host,
+    source,
+    componentPath,
+    'viewProviders',
+    symbolName,
+    'Component'
+  );
+}
+
 export function addDeclarationToModule(
   host: Tree,
   source: ts.SourceFile,